Most companies these days restrict their internet access by forcing the usage of web proxy. If your company is forcing a proxy policy & you are running Redhat/CentOs/Fedora you will have to update your yum.conf to be able to update your desktop or server using yum over a proxy connection. Luckily setting up yum to run over a proxy is an easy task. below is the few steps you need to follow to establish just that.

Edit the file/etc/yum.confand add the following lines:

# The proxy server - server: port proxy=http://proxy.mydomain.com:3128# If proxy authentication is required proxy_username=yum_user proxy_password=yun_user_passwordThe next step is to declare the variable http_proxy to run
when the yum rpm get executed to avoid the below error:

and also o tried the following….sorry didnt mention it earlier…
domain\User Name, DOMAIN\User Name, domain%5CUser%20Name, DOMAIN%5CUser%20Name…none of this worked….then i tried the above on the authentication prompt for browser it didnt work either….